27
Malfunctions
– continued –
Fault finding list for troubleshooting
– continued –
Green LED 1 and red LED 2 are not illuminated
Fault:
The electrode and the control unit cannot communicate.
Remedy:
Check 24 V bus supply, wiring, node ID, baud rate and terminating resistors.
If modifications have to be made, switch off the mains voltage and switch it on again after
about 5 sec.
Cleaning measuring electrode
The equipment must only be installed and removed by qualified and competent staff.
For more information refer to chapter “Installation” on page 16.
Before cleaning the measuring electrode(s), decommission and remove the conductivity electrode.
We recommend cleaning the electrode at least once a year, e. g. as part of maintenance work.
LRG 16-41
Clean the electrode rods.
LRG 16-40, LRG 16-41
,
LRG 17-40
n
Wipe off non-adhesive deposits with a grease-free cloth.
n
To remove adhesive deposits use emery cloth (medium grain).
Replacing electronic circuit board
1. Undo cover screws
B
and remove terminal cover
D
.
2. Pull the electrode wires out of the terminal lugs
K
on the circuit board.
Remove terminal strip
F
.
3. Undo earth connection
H
.
4. Unscrew the fixing screws
G
of the electronic circuit board and take out the circuit board. The
circuit board is available as spare part type LRV 1-41 for LRG 16-40, LRG 17-40 and type LRV 1-43
for LRG 16-41.
5. Install the new electronic circuit board in reverse order.
Note
When ordering spare parts please state the material number and the length indicated on
the name plate LRG/LRGT.
After replacing the electronic circuit board carry out reference measurements in order
to check the conductivity readings indicated by the operating device URB or
SPECTOR
control
.
If deviations occur correct the cell constant of the electrode. Observe the installation
instructions of URB or SPECTOR
control
.
Summary of Contents for LRG 16-40
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